Shifting device for calculating-machines.



R. BiiRK.

SHIFTING DEVICE FOR CALCULATING MAGHINES.

APPLICATION FILED JULY 6, 1908.

11115111 11 June 27,1911.

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R. BfiRK. SHIFTING DEVICE FOR CALCULATING MACHINES.

APPLIOATION FILED JULY 6, 1908.

2 SHEETS-SHEET 2.

A St: nventor (RMLwL'm/k A? b Mam Patented Jun 27, 1911.

UNITED S PATNT RICHARD B ll'RK, OF SCI-IWENNINGEN, GERMANY.

SHIFTING DEVICE FOR CALCULATING-MACHINES.

Application filed July 6, 1908. Serial No. 442,117.

T 0 all whom 'it may concern:

Be it known that I, RICHARD Bonn, a citizen of the German Empire, residing at Schwenningen, in the Kingdom of Vvtic temberg, Empire of Germany, have invented certain new and useful Improvements in Shifting Devices for Calculating-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in. the art to which it appertains to make and use the same.

This invention has for its object a shifting device for calculating apparatus. In these calculating machines a number of operating wheels are provided, which, in calculating, must be depressed separately and then turned. Now it may happen that the operating wheels which are not employed are accident-ally also depressed and perhaps somewhat prematurely turned forward, whereby the work is interrupted. This drawback is avoided by the present invention, which has for its object, when a wheel is depressed, to lock the others by means of a suitable locking device in such a way that they cannot be depressed, and accordingly also cannot be operated.

The object of the invention will now be more particularly described in connection with the accompanying drawings, in one form of construction as an example.

In these drawings :Figure l is a front elevational view of a calculating machine, having my invention applied thereto. Fig. 2 is a side view of Fig. 1 partly in section; Fig. 3 is a plan of Fig. l; and Fig. l an enlarged front elevation of the locking device detached. Fig. 5 is a view similar to Fig. 2, showing the end plate of the machine removed to clearly illustrate the structure and mo de of operation of the operating wheels; Fig. 6 is a front elevational view, parts being shown in section, of my improved machine.

The calculating apparatus referred to generally as a is of the type embodying a plurality of operating wheels, which when depressed, operate the counting wheels through suitable intermeshing gearings 1516, these operating wheels I), each corresponding to a given figure value, which wheels, carried by rocking levers (Z, must be lowered in order to be operated before they can be turned, whereupon the result is-visible on the indicating or counting wheels 0.

The operating wheels Z) and their levers (Z which are pivotally supported at 10 are acted on by springs e which engage under the levers (Z and automatically press upward, into the locked. position, the operating wheels 6 after they are released. Now in order to prevent several operating wheels 6 from being simultaneously depressed, a number of two-armed levers are provided which turn on pins 9. Now these levers are of such a form and so arranged that they alternately engage with their free ends the levers (Z of the other operating wheels Z) when one operating wheel .7) is depressed, and thereby render the depression of the re maining operating wheels impossible. The arrangement and location of said series of levers f, f f f f and f is best shown in Figs. 4 and 3, in which the ends of the longest lever f are in the path of the lovers (Z supporting the 1 wheel and 9 wheel; the ends of the lever f in the path of the levers (Z carrying the 3 wheel and 9 wheel; those of the lever f in the path of the levers (Z of the 1 wheel and the l wheel; lever f" is actuated by depressing either the lever (Z of 3 wheel or the lever (Z of 4 wheel, while the levers f and f with their outer ends are arranged under the levers (Z carrying the 1 wheel and 3 wheel, and the i wheel and 9 wheel respectively.

By depressing either one of the levers (Z the ends of the three levers are thereby always moved downward, and their free ends press and lock the remaining three levers of the other operating wheels, as will be manifest. If for instance the l-wheel be depressed its lever (Z presses the respective ends of the levers f f and f downward, whereupon the raised ends of these levers lift and lock the levers (Z of the other wheels. Thus for instance by depressing the 3-wheel, by the lever f the 9-wheel is fixed, by the lever f the t-wheel, and by the lever f the 1- wheel. On depressing the twheel, the 1- wheel is locked by the lever F, the 3-wheel by the lever f and by the lever i the 9- wheel. Finally on operating the 9--wheel the lever f locks the l-wheel, lever f the 3-whecl, and the lever f the e-wheel. Any false calculation is in this Way entirely avoided.

I declare that What I claim is In a calculating apparatus the eombinution with a series of indicating Wheels of a series of calculating wheels for actuating the same, a rocking lever carrying each of said calculating Wheels, and a plurality of pivoted levers of varying lengths adapted when one of said rocking levers is depressed,

to lock the other rocking levers against movement, substantially as described. 10

In testimony whereof I affix my signature, in presence of two Witnesses.

RICHARD BURK. lVitnesses JEAN GULDEN, ADOLF GRIMM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

